• Arthur S Hong, Amy Hughes, D Mark Courtney, Hannah Fullington, Craddock LeeSimon JSJ, John W Sweetenham, Navid Sadeghi, Song Zhang, Angela Bazzell, and Ethan A Halm.
• The University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9169. Email: Arthur.Hong@UTSouthwestern.edu.
• Am J Manag Care. 2023 Sep 1; 29 (9): e267e273e267-e273.

ObjectivesAdults with a new diagnosis of cancer frequently visit emergency departments (EDs) for disease- and treatment-related issues, although not exclusively. Many cancer care providers have 24/7 clinician phone triage available, but initial recorded phone messages tend to advise patients to go to the nearest ED if they are "experiencing a medical emergency." It is unclear how well patients triage themselves to the optimal site of care.Study DesignCross-sectional study of tumor registry records (university patients diagnosed 2008-2018 and safety-net patients diagnosed 2012-2018) identifiably linked to electronic health records and a regional health information exchange.MethodsWe geoprocessed addresses to calculate driving time distance from the patient's home to the ED. We used mixed-effects regression to predict the diagnosis code-based severity for ED visits within 6 months of diagnosis, clustering visits within patients and hospitals.ResultsA total of 39,498 adults made 38,944 ED visits to 67 different hospitals. Patients self-referred for 85.5% of visits and bypassed a median (IQR) of 13 (4-33) closer EDs. Visits closer to home were not significantly more clinically severe; visits were significantly less severe if the patient self-referred (adjusted odds ratio [AOR], 0.89; 95% CI, 0.81-0.97) or they were on weekends (AOR, 0.93; 95% CI, 0.87-0.99). Reanalyzing within each individual health system also showed similar findings.ConclusionsAdults with cancer infrequently use available clinician advice before visiting the ED and may use factors other than clinical severity to determine their need for emergency care. Future work should explore the challenges that patients face navigating unplanned acute care, including reasons for underusing existing resources.

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